GCSE Science C3 Chemical Economics Revision List

GCSE Chemistry C3 (OCR B721): Chemical Economics

Year 11 additional science revision for the GCSE Chemistry C3 9-1 course. If you are looking to revise for your GCSE Chemistry C3 exam then looking through the topics and specification before you get into the detail is always a good start.

C3a Rate of reaction (1)

Recognise that some reactions can be fast and different rates of reaction. others very slow e.g.

rusting is a slow reaction

burning and explosions are very fast reactions.

Label the laboratory apparatus needed to measure the rate of reaction producing a gas:

Interpret data in tabular, graphical and written form about the effect of surface area and the addition of a catalyst on the rate of reaction:

deciding when a reaction has finished,

comparing the rate of reaction during a reaction.

Draw sketch graphs to show the effect of changing surface area and the addition of catalyst

rate of reaction

amount of product formed in a reaction.

Interpret data from tabular, graphical and written forma about the effect of surface area and the addition of a catalyst on the rate of reaction:(HL)

calculating the rate of reaction from the slope of an appropriate graph

extrapolation

interpolation

C2d Reacting masses

Calculate the relative formula mass of a substance from its formula (no brackets) given the appropriate relative atomic masses.

Understand that the total mass of reactants at the start of a reaction is equal to the total mass of products made and that this is called the principle of conservation of mass ‘law of conservation of mass).

Be able to use the principle of conservation of mass to calculate mass of reactant or product for example:

a) mass of gaseous product formed during decomposition

b) mass of oxygen that reacts with a known mass of magnesium to make magnesium oxide.

Use simple ratios to calculate reacting masses and product masses given the mass of a reactant and a product

Calculate the relative formula mass of a substance from its formula (with brackets) given appropriate relative atomic masses.

Be able to use provided relative formula masses and a symbol equation (1:1 molar ratio) to show that mass is conserved during a reaction.

Explain why mass is conserved in chemical reactions.

Use relative formula masses and a provided ANY symbol equation to show that mass is conserved during a reaction.(HL)

Be able to recognise and use the idea that the mass of product formed is directly proportional to the mass of limiting reactant used.

Interpret chemical equations quantitatively. and that can product masses(HL)